Cyc_make_shared_object cyc_thread_state_type DEBUG_SHOW_DIAG gc_add_mutator gc_add_new_unrunning_mutator gc_alloc gc_alloc_bignum gc_alloc_rest gc_allocated_bytes GC_COLLECT_UNDER_UNSWEPT_HEAP_COUNT GC_COLLECTION_THRESHOLD gc_collector_trace gc_color_blue gc_color_red gc_copy_obj GC_DEBUG_SHOW_SWEEP_DIAG GC_DEBUG_TRACE GC_DEBUG_VERBOSE gc_empty_collector_stack gc_free_list GC_FREE_THRESHOLD gc_grow_heap gc_handshake gc_header_type gc_heap gc_heap_create gc_heap_create_rest gc_heap_free gc_heap_last gc_heap_merge gc_heap_root gc_heap_type gc_init_fixed_size_free_list gc_init_heap gc_initialize gc_is_mutator_active gc_is_mutator_new gc_is_stack_obj gc_mark_globals gc_mark_gray gc_mark_gray2 gc_merge_all_heaps gc_mut_cooperate gc_mut_update gc_mutator_thread_blocked gc_mutator_thread_runnable gc_post_handshake gc_print_stats gc_remove_mutator gc_request_mark_globals GC_SAFETY_CHECKS gc_sleep_ms gc_stage_type gc_start_collector gc_status_type gc_sweep gc_thr_grow_move_buffer gc_thread_data gc_thread_data_free gc_thread_data_init gc_try_alloc gc_try_alloc_rest gc_try_alloc_slow gc_wait_handshake grayed GROW_HEAP_BY_SIZE HEAP_SIZE immutable INITIAL_HEAP_SIZE LAST_FIXED_SIZE_HEAP_TYPE mark mark_buffer MAX_STACK_TRACES NANOSECONDS_PER_MILLISECOND NUM_HEAP_TYPES return_thread_runnable return_thread_runnable_with_obj set_thread_blocked

gc_mut_update() void gc_mut_update ( gc_thread_data *  thd, object  old_obj, object  value  ) Write barrier for updates to heap-allocated objects. Parameters thd Mutator's thread data old_obj Old object value prior to the mutation value New object value The key for this barrier is to identify stack objects that contain heap references, so they can be marked to avoid collection.